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Title: Photosynthate allocations patterns and mode of postfire reproduction in two shrub species from the California chaparral

Abstract

Age-specific patterns of photosynthate allocation in leaves were investigated for two chaparral shrubs, Adenostoma fasciculatum and Ceanothus greggii, in five stands of various ages. Branches of shrubs were labeled with {sup 14}CO{sub 2}, and seasonal allocation of {sup 14}C-labeled photosynthate to storage, defense, metabolic, and structural compounds was followed. Age-specific allocation patterns were found only in the spring, when older shrubs showed a reduced allocation of photosynthate within leaves to storage compounds. Older shrubs may be less able than younger shrubs to allocate photosynthate to storage compounds when demands on photosynthate for growth are high. The influence of senescence on postfire sprouting was investigated by quantifying the proportion of standing dead biomass in A. fasciculatum, as well as other shrub structural characteristics, before an experimental burn. After the burn, sprout production during the first postfire season was determined and correlated with prefire structural characteristics. Photosynthate allocation to shoots and roots was investigated for seedlings of both species.

Authors:
Publication Date:
Research Org.:
California Univ., Davis, CA (USA)
OSTI Identifier:
6533629
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; FIRES; BIOLOGICAL EFFECTS; SHRUBS; PHOTOSYNTHESIS; CALIFORNIA; CARBON 14 COMPOUNDS; CARBON DIOXIDE; PLANT GROWTH; REPRODUCTION; SEEDLINGS; SPROUTING; TRACER TECHNIQUES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; FEDERAL REGION IX; GROWTH; ISOTOPE APPLICATIONS; LABELLED COMPOUNDS; NORTH AMERICA; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; SYNTHESIS; USA; 550201* - Biochemistry- Tracer Techniques

Citation Formats

Sparks, S R. Photosynthate allocations patterns and mode of postfire reproduction in two shrub species from the California chaparral. United States: N. p., 1989. Web.
Sparks, S R. Photosynthate allocations patterns and mode of postfire reproduction in two shrub species from the California chaparral. United States.
Sparks, S R. 1989. "Photosynthate allocations patterns and mode of postfire reproduction in two shrub species from the California chaparral". United States.
@article{osti_6533629,
title = {Photosynthate allocations patterns and mode of postfire reproduction in two shrub species from the California chaparral},
author = {Sparks, S R},
abstractNote = {Age-specific patterns of photosynthate allocation in leaves were investigated for two chaparral shrubs, Adenostoma fasciculatum and Ceanothus greggii, in five stands of various ages. Branches of shrubs were labeled with {sup 14}CO{sub 2}, and seasonal allocation of {sup 14}C-labeled photosynthate to storage, defense, metabolic, and structural compounds was followed. Age-specific allocation patterns were found only in the spring, when older shrubs showed a reduced allocation of photosynthate within leaves to storage compounds. Older shrubs may be less able than younger shrubs to allocate photosynthate to storage compounds when demands on photosynthate for growth are high. The influence of senescence on postfire sprouting was investigated by quantifying the proportion of standing dead biomass in A. fasciculatum, as well as other shrub structural characteristics, before an experimental burn. After the burn, sprout production during the first postfire season was determined and correlated with prefire structural characteristics. Photosynthate allocation to shoots and roots was investigated for seedlings of both species.},
doi = {},
url = {https://www.osti.gov/biblio/6533629}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}

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